In a family of five members: P, Q, R, S, and T, P is the father of Q, Q is the mother of R, and S is the sister of T. If T is the son of P, who is R's grandmother?
A family consists of a mother, a father, and two children. The mother is a lawyer, the father is an engineer, and one child is a musician. If the other child is not a musician, what is the profession of the second child?